真空堆载预压法控制高速公路软土地基沉降的现场监测试验分析
摘要:真空堆载预压法具有真空预压和堆载预压双重加固效果,真空预压产生的侧向收缩变形与堆载产生的侧向挤出变形相抵消,保证了上部路堤的稳定性,加速地基土的固结,提高了施工速度。依托高速公路软基处理实体工程,设置四个现场监测试验段,对完整有效的观测断面的沉降进行了全程监测。分析结果表明,真空堆载预压法加固的路基沉降量主要发生在初期和中期,沉降速率在监测初期较大、中期时达到最大值,后期的沉降量和沉降速率减小,最后阶段最大沉降速率为0.09 cm/d,小于堆载预压规定的允许值1cm/d的要求,表明真空堆载预压法加固效果显著。
Abstract:The combined vacuum surcharge preloading method has the double reinforcement effects of vacuum preloading method and surcharge preloading method. The lateral extrusion deformation due to surcharge preloading was counteracted by the lateral shrinkage induced by vacuum preioading, which ensures the stability of the upper embankment, accelerates the subsoil consolidation and enhances the construction speed. Based on the practical engineering of expressway soft soil treatment, the full monitoring was conducted for the complete and effective observation sections, according to four field test sections. The analyzed results show that the main settlement reinforced by the combined vacuum surcharge preloading method occurs in the early and middle phrase; the settlement and rate is large in the early stage,reaches maximum in the middle stage and becomes little in the last stage; the maximum settlement rate is 0. 09cm/d and less than the allowable value of 1cm/d required by of surcharge preloading method,which indicates that the reinforcement effect of combined vacuum surcharge preloading method is significant.
中文标题：
真空堆载预压法控制高速公路软土地基沉降的现场监测试验分析
Field Monitoring Test Analysis of Controlling Settlement for Expressway Soft Foundation by Combined Vacuum Surcharge Preloading Method
作者：
尹湃1,黄作俊2,袁小林3
Yin Pai1,Huang Zuojun2,Yuan Xiaolin3
作者简介:尹湃,1984年生,男,辽宁丹东人,工程师,主要从事岩土工程地基处理人以及工程管理方面的研究。E-mail:octopus200@163.com
通讯地址：
1. 交通运输部天津水运工程科学研究所, 天津 300456; 2. 天津南港工业区港务有限公司, 天津 300280; 3. 中交一航局第一工程有限公司, 天津 300456
1.TianjinResearchInstituteforWaterTransportEngineering,Ministryoftransport,Tianjin300456,China; 2.TianjinNangangIndustrialZonePortCo.,Ltd,Tianjin300280,China; 3.No.1EngineeringCompanyLTD.ofCCCCFirstHarborEngineeringCompanyLTD.Tianjin300456,China
中图分类号:TU196.2
doi:10.3969/j.issn.1007-2993.2013.01.003
出版物：岩土工程技术
收稿日期:2012-10-12
关键词:真空堆载预压法,软基处理,沉降控制,现场监测试验
Key words:combined vacuum surcharge preloading method,soft ground treatment,settlement control,field monitoring test
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